Oh.

And like every time, I look at the UI description, I look at the sketches I made, I look at the interaction I imagined, I look at the system I sold to partners and managers, I look at the programming API and available tools, I look at what I know can fit on a device, and once again, yet again, when there is nothing more to read and nothing more to sketch,  I ask myself, just once again...

...how the hell are you gonna make this one happen this time?

Better get to work.